Merge "Fixes few corner issues of multi-window windowing mode split-screen"...

Merge "Fixes few corner issues of multi-window windowing mode split-screen" into sc-dev am: 57990479

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13877246

Change-Id: Iece16c6cc3c26fba5c8b3afff8b2ca9520d3f7e2